Influence of recirculation of liquid fraction of the digestate (LFD) on maize stover anaerobic digestion

Hu, Yun; Shen, Fei; Yuan, Hairong; Zou, Dexun; Pang, Yunzhi; Yan-ping, Liu; Zhu, Baoning; Wachemo, Akiber Chufo; Jaffar, M.; Li, Xiujin

doi:10.1016/j.biosystemseng.2014.09.006

Cited by 29 publications

(29 citation statements)

References 20 publications

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“…The OLR increased (Figure 2) with decreasing RA, and the HRT (Figure 2 The reduction in the RA caused significant variations amongst the test setups in terms of the OLR and the HRT, in contrast to other studies where the recirculation of the liquid fraction of the digestate did not lead to significant differences [27].…”

Section: Resultsmentioning

confidence: 49%

Effects of Biogas Substrate Recirculation on Methane Yield and Efficiency of a Liquid-Manure-Based Biogas Plant

2017

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Biogas plants are the most complex systems and are heavily studied in the field of renewable energy. A biogas system is mainly influenced by biological and technical parameters that strongly interact with each other. One recommended practice when operating a biogas plant is the recirculation of the substrate from the second fermenter into the first fermenter, which extends the recirculation amount (RA) and, in turn, the recirculation rate (RR). This technique should be applied to support and secure the biogas process. In this investigation, the RA was varied, starting with the recommended "best practice" of 10.0 m 3 /d (RR 40%). Every ten days, the RA was reduced in steps of 1.5 m 3 /d, with 5.5 m 3 /d (RR 27%) being the final value. The basic question to be addressed concerns to what extent the RR influences the methane yield and thereby influence the efficiency of a manure-based biogas plant in practice. Diverting the "best practice" to a RR of 27% stabilised the fermentation process and lead to significantly higher methane yields with smaller standard deviations. In addition, with a reduced RR, the standard optimal acid concentration within the biogas substrate was approximately reached.

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Section: Resultsmentioning

confidence: 49%

Effects of Biogas Substrate Recirculation on Methane Yield and Efficiency of a Liquid-Manure-Based Biogas Plant

2017

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“…However, the utilization or treatment of LD is a challenge. LD can be used as liquid fertilizer or can be disposed of in the water streams after treatment; however, the most promising option is its recycling to the digester [94].…”

Section: Recycling Liquid Digestate (Ld)mentioning

confidence: 99%

“…The recycling of LD can help to improve the moisture content for some high solid substrates [94] and provides a range of nutrients and vitamins needed by the microorganisms [95]. However, the excessive recycling may result in process inhibition by the accumulation of VFAs, ammonia, and nonbiodegradable intermediates [94,96,97].…”

Section: Recycling Liquid Digestate (Ld)mentioning

confidence: 99%

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A Review on the Fate of Nutrients and Enhancement of Energy Recovery from Rice Straw through Anaerobic Digestion

2020

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Open field burning and tilling the rice straw (RS) back into the fields causes environmental threats by contributing to the increased greenhouse gas emissions. Energy and nutrient recovery from RS through anaerobic digestion (AD) is an effective solution for its utilization. Although RS has good methane potential, its characteristics make it a difficult substrate for AD. This paper reviews the characteristics of RS, mass balance, and distribution of nutrients into liquid and solid digestate in the AD. The present review also discusses the effect of temperature, co-digestion, mixing, inoculum, organic loading rate, recycling liquid digestate, the addition of trace elements, and their bioavailability on the enhancement of biogas/methane yield in the AD of RS. In addition, the digestion of RS at various scales is also covered in the review.

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“…This point is particularly relevant because digestate pH is generally alkaline and favours the presence of free ammonia. To avoid ammonia inhibition, recent studies have shown how ammonia can be reduced through stripping or airing stages before the recirculation of the digestate liquor 76,77 . In contrast, for feedstocks with low nutrient contents (i.e.…”

Section: Digestate Conversion Into Energymentioning

confidence: 99%

New opportunities for agricultural digestate valorization: current situation and perspectives

Monlau

Sambusiti

Ficara

et al. 2015

Energy Environ. Sci.

411

192

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Influence of recirculation of liquid fraction of the digestate (LFD) on maize stover anaerobic digestion

Cited by 29 publications

References 20 publications

Effects of Biogas Substrate Recirculation on Methane Yield and Efficiency of a Liquid-Manure-Based Biogas Plant

Effects of Biogas Substrate Recirculation on Methane Yield and Efficiency of a Liquid-Manure-Based Biogas Plant

A Review on the Fate of Nutrients and Enhancement of Energy Recovery from Rice Straw through Anaerobic Digestion

New opportunities for agricultural digestate valorization: current situation and perspectives

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